class_docstr: Utils class used for grouping sum summands together.
code: def __init__(self):
      self.queue = {}
  
imports: import itertools
  from copy import copy
  from typing import List
  import numpy
  import pennylane
  from pennylane import math
  from pennylane.operation import Operator
  from pennylane.ops.qubit import Hamiltonian
  from pennylane.queuing import QueuingManager
  from .composite import CompositeOp
label_desc: Use image node_id 1 to create a new _SumSummandsGrouping object  with example: obj = _SumSummandsGrouping()